From 9/2001 –6/2002 we estimated the prevalence of Listeria monocytogenes and Listeria spp., in the environment, and raw pork products of a meat plant. Of 41environmental samples taken before and after initiation of slaughtering, in 2 visits, 10.7% and 7.7% of the samples respectively harbored L. monocytogenes. In each of 2 additional visits we collected 45 samples each time from carcass surfaces. L. monocytogenes was present 2.2% and 2.2% of the samples respectively. Of 109 environmental surface samples from the deboning room before and 104 taken 2-3 h after the beginning of the operation 3.7% and 5.8% harbored L. monocytogenes. Of 132 environmental surfaces samples taken before and 125 after the initiation of work in a special working area handling the cutting and packaging of modified atmosphere (MAP) consumer size meat cuts 3% and 5.6% harbored L. monocytogenes. Of 35 wholesale meat cuts from imported meat collected in the central deboning and cutting room 34.3% harbored L. monocytogenes. Finally of 201 consumer size MAP products prepared from the company`s own pig carcasses, 6% harbored L. monocytogenes. The results indicated the low prevalence of L.monocytogenes on local origin carcasses and MAP cuts prepared from such carcasses under strict sanitary conditions. Cross contaminations of equipment and worker’s hands from imported meats may result in excessive contamination of meat cuts whether the meat is imported or local.